Like previous “s” releases, the iPhone 6s is defined by a single feature. This time around, that new feature is 3D Touch which is best described as right-click for your iPhone. The new iPhone 6S also features an upgraded 12-megapixel iSight camera and 4K video. Powering the iPhone 6s is a new A9 processor. This third-generation 64-bit chip is up to 70 percent faster than the A8 and offers up to 90 percent faster GPU performance.